Display Device with Touch Panel Providing Touched Position Detection and Pressing Force Detection

1. A touch panel comprising: a driving circuit; a detection circuit; a drive line; a first reception line; a second reception line; a piezoelectric polymer layer including a contact hole; a driving electrode formed on a first main surface of the piezoelectric polymer layer and that is connected to the driving circuit via the drive line; a pressing force detection electrode formed on a second main surface of the piezoelectric polymer layer and that is connected to the driving circuit via the drive line; and a touch detection electrode formed on the first main surface of the piezoelectric polymer layer and on an inside of the contact hole and that is connected to the detection circuit via the first reception line; and a dummy electrode that is formed at a position on the second main surface, which is opposed to the touch detection electrode, and that is not connected to the driving circuit, is not connected to the detection circuit, and is electrically connected to a portion of the touch detection electrode that is formed on the inside of the contact hole.

2. The touch panel according to claim 1 , wherein the pressing force detection electrode is formed at a position overlapped with the driving electrode or the touch detection electrode.

3. The touch panel according to claim 1 , wherein the driving electrode, the touch detection electrode, and the pressing force detection electrode have rhombus shapes.

4. The touch panel according to claim 1 , wherein the driving electrode, the touch detection electrode, and the pressing force detection electrode have comb shapes.

5. A display device including the touch panel according to claim 1 .